Re: Re: Re: Preventing an image from caching

With CGI.pm, you can use the -expires switch to the header routine. Apparently, CGI::Util also has an expires routine that you can use to calculate the proper format. If you don't like digging around in the innards of CGI.pm, pull up HTTP::Date, which formats things according to the RFC. Something like this:

use HTTP::Date qw(time2str);
my $now = time2str(time);
print "Expires: $now\nLast-modified: $now\n";
# add other headers here
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-- Randal L. Schwartz, Perl hacker

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Re: Re: Re: Re: Preventing an image from caching by andye (Curate) on Nov 28, 2000 at 15:45 UTC
Setting Expires to 0 seems to work also; I think it's in the http/1.1 RFC (RFC 2068) somewhere as an OK thing to do. Also the following might be relevant: `Pragma = no-cache` (http/1.0) `Cache-Control = no-cache` (http/1.1) (bearing in mind that proxy servers in between you and your users might be http/1.0 or http/1.1, although the 1.1 ones should be backwards compatible, presumably) andy.	[reply] [d/l] [select]